Set of Four Handkerchief Armchairs by Vignelli

The side chairs can be found with some difficulty, but a set of four upholstered Handkerchief armchairs by Massimo Vignelli -- designer of the the iconic Manhattan subway map and Bloomigdales' Big Brown Bag -- for Knoll is a rarity.
Additional Condition Notes:
Good. Unless otherwise noted, wear consistent with age and use. Some impressions in the seats from stacking should diminish over time but may not disappear completely.
Dimensions:
20" (50.8cm) D x 26" (66.04cm) W x 29" (73.66cm) H; Seat 18" (45.72cm) H